PORTLAND, Ore. (KOIN) — At exactly 10:21 on Thursday, the largest earthquake drill of its kind will happen on the west coast.

It’s the Great Shakeout — a day for people living in seismically active areas to prepare for a major earthquake. The goal is to make the three-step process — drop, cover and hold on — an instinctive reaction to the ground shaking.

Oregon Office of Emergency Management Director Andrew Phelps joined AM Extra to discuss the big shake.